/Engine/Source/Runtime/AIModule/Classes/BehaviorTree/BehaviorTreeTypes.h
If set the action was unnecessary (Remove and was already inactive, Add and was already active)
FBehaviorTreeSearchUpdate ( const [UBTTaskNode](API\Runtime\AIModule\BehaviorTree\UBTTaskNode) * InTaskNode, uint16 InInstanceIndex, [EBTNodeUpdateMode::Type](API\Runtime\AIModule\BehaviorTree\EBTNodeUpdateMode__Type) InMode )